# 打印100 以内的额质数
def is_prime(num):
    if num<=1:
        return  False
    for i  in range(2,int(num**0.5)+1):
        if num%i==0:
            return  False
    return True

def print_prime(n):
    for num in range(2,n+1):
        if is_prime(num):
            print(num,end="")
print_prime(100)